<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>5-5 Bootstrap组件-控件组</title>
    <link rel="stylesheet" href="./bootstrap-3.3.7/dist/css/bootstrap.min.css">
    <script src="jquery/jquery-3.4.1.min.js"></script>
    <script src="bootstrap-3.3.7/dist/js/bootstrap.min.js"></script>

</head>
<body>


<div class="input-group">
    <sapn class="input-group-addon">$</sapn>
    <input type="text" class="form-control">
</div>

</body>
</html>
